声明
Abstract
Table of Contents
1 Introduction
1．1 Background
1．2 Magnetoresponsive Effects
1．2．1 Magnetocaloric Effect(MCE)
1．2．2 Magnetostriction
1．3 Magnetically ordered MM’X compunds：structure and magnetic properties
1．3．1 MnCoSi
1．3．2 MnCoGe
1．3．3 MnNiGe
1．3．4 MnNiSi
1．3．5 How to fulfill the magnetostructural coupling in MnM’X alloys
1．4 Main content and focus of the thesis
2 Experimental methods
2．1 Sample preparation methods
2．1．2 Vacuum tube sealing unit
2．1．3 Mume furnace
2．2 Characterization techniques
2．2．1 X-ray Diffractometry
2．2．2 Differential Scanning Calorimetry
2．2．3 Vibrating Sample Magnetometer
3 Structural and magnetic properties of Mn1-yCoyNiSi1-xGax alloys
3．1 Structural properties of Mn1-yCoyNiSi1-xGax bulk alloys
3．2 Influence of annealing treatment on structural properties of Mn0．6Co0．4NiSi1-xGax bulk alloys
3．3 Structural phase transition of Mn0．5Co0．5NiSi1-xGax bulk alloys
3．4 Magnetic properties of Mn0．5Co0．5NiSi1-xGa1-x bulk alloys
3．5 Chapter Summary
4 Structural and magnetic properties of Mn0．7Co0．6Ni0．7Si1-xGax and Mn0．7Co0．7Ni0．6Si1-xGax alloys
4．1 Structural properties of Mn0．7Co0．6Ni0．7Si1-xGax and Mn0．7Co0．7Ni0．6Si1-xGax bulk alloys
4．2 Magnetostructural transformation in Mn0．7Co0．6Ni0．7Si1-xGax system
4．3 Chapter Summary
5 Magnetostructural transition and magnetocaloric effect in Mn1-yCo2yNi1-ySi1-xGax bulk alloys
5．1 Structural properties of Mn1-yCo2yNi1-ySi1-xGax bulk alloys
5．2 Magnetostructural transformation in Mn0．85Co0．3Ni0．85Si1-xGax system
5．3 Magnetocaloric effect in Mn0．85Co0．3Ni0．85Si1-xGax system
5．4 Chapter Summary
Conclusions
Acknowledgements
References
Appendices
